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Poroplate Backwashable Filter Elements

Poroplate Backwashable Filter Elements
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Poroplate Backwashable Filter Elements - 1

8439 Triad Drive • Greensboro, NC 27409-9621 P: 336-668-4444 • F: 336-668-4452 • E: info@purolator-facet.com • www.purolator-facet.com BACK WASHING POROPLATE® FILTER ELEMENTS Poroplate® diffusion bonded wire cloth laminate filter elements are designed and manufactured to withstand repeated high pressure back washing. The surface type filter media characteristic of Poroplate® media allows for repeated cleaning of the element in place, i.e., without removal from the filter housing. The number of back flush cycles prior to element removal depends on a number of factors including back wash duration and pressure, flow rate, terminal pressure drop, and the physical properties of the contaminant being filtered. There are several accepted methods of back washing Poroplate® filter elements. The method selected should take into consideration the available plant equipment as well as the fluid being filtered and the nature of the contaminant. Listed below are a few generally accepted procedures for effective back washing. These procedures apply only to liquid service filters. GAS/AIR BLOW DOWN This method of back washing is the least expensive as it does not require the use of any solvents or other back wash liquid. The flow to the filters is stopped. The product being filtered remains in the filter chamber. The outlet valve leading downstream and inlet valve coming from the pump are dosed. The gas/air inlet valve is opened, as is the backwash discharge valve. The product on the clean (downstream) side of the filter is forced in a reverse direction through the filter elements and out of backwash discharge valve. Once the product has been forced from the element, the gas continues to flow to purge the system of any residual solids inside the vessel. This method utilizes the force of the air or gas pressure and the product on the clean side of the filter element to force the debris from the surface of the element. In cases where the contaminant is particularly heavy or has an adhesive nature, multiple air or gas blow down cycles may be required. A gas pressure of 80 -100 psi is recommended for best results.

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Poroplate Backwashable Filter Elements - 2

REVERSE FLOW OF SOLVENT OR CLEAN PRODUCT This technique uses a liquid that is pumped in the reverse flow direction to effectively back wash the elements. The solvent is usually allowed to soak in the vessel with dirty elements for a predetermined length of time depending on the degree of contamination and the solubility of the contaminant in the solvent used. After the soak time has been completed, additional solvent is pumped backwards through the elements. The solvent is then evacuated by a gas purge. If clean product is used for the back wash liquid, no soak time is required. The vessel...

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Poroplate Backwashable Filter Elements 2Pages

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Poroplate Backwashable Filter Elements
2Pages